20499749385 has 16 divisors (see below), whose sum is σ = 32802226560. Its totient is φ = 10932323840.

The previous prime is 20499749371. The next prime is 20499749399. The reversal of 20499749385 is 58394799402.

It is an interprime number because it is at equal distance from previous prime (20499749371) and next prime (20499749399).

It is not a de Polignac number, because 20499749385 - 2¹¹ = 20499747337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167980 + ... + 263090.

It is an arithmetic number, because the mean of its divisors is an integer number (2050139160).

Almost surely, 2^20499749385 is an apocalyptic number.

It is an amenable number.

20499749385 is a deficient number, since it is larger than the sum of its proper divisors (12302477175).

20499749385 is a wasteful number, since it uses less digits than its factorization.

20499749385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109488.

The product of its (nonzero) digits is 19595520, while the sum is 60.

The spelling of 20499749385 in words is "twenty billion, four hundred ninety-nine million, seven hundred forty-nine thousand, three hundred eighty-five".